Ankle boot



FIG. 1 is a enlarged front elevational view of an ankle boot showing mynew design;

FIG. 2 is a enlarged rear elevational view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a perspective view thereof; and,

FIG. 8 is another perspective view thereof.

The broken lines shown on the ankle boot illustrate stitch lines thatbelong to part of the claimed design.

CLAIM The ornamental design for an ankle boot, as shown and described.